How can I go back to Nigeria my Visa have expired...

We would like to inform you that if you mean that you are resident in UAE and you have a work visa and want to leave, you must obtain an exit permit and NOC from the employer and therefore who will submit the procedures is the sponsor. So you can apply personally online but it needs a permit and NOC from the sponsor for leave
If you have another question, feel free to ask us and we will answer with pleasure.